A:AnswerYes, it comes with a tool that you place over your phone to help put the shield on straight. It also comes with a few instructions/tips to help the shield adhere properly.
A:AnswerAbsolutely, they took off plastic and replaced with glass. Much better protection for your screen. I am careful but you know they fall in the worst places, hard floor, etc. Register for ZAGG limited lifetime replacement.
A:AnswerThis will not protect your whole phone, only the screen. The s8 Is supposed to be a waterproof phone already. Look for a waterproof case like the LifeProof - Fre Protective Water-resistant Case for Samsung Galaxy S8 if you need something more. My daughter got this and was very happy with it.